Exhaust - Lennox CLIMATIC series User Manual

COMPONENTS
EXHAUST (OPTION)
Function
The CLIMATIC manage 2 different type of exhaust
• A step control up to three exhaust fans to assure a good differential pressure between the supply and the return air. Starts and
stops of these fans depend on the opening of the fresh air damper
• A continuous exhaust when the unit is equipped with a variable speed fan.
Description
Step control exhaust
The exhaust fan(s) are activated according to the fresh air opening pourcentage of the damper.
• if the fresh air opening ≥ (3861), the stage 1 is turned on,
• if the fresh air opening ≥ (3862), the stage 2 is turned on,
• if the fresh air opening ≥ (3863), the stage 3 is turned on.
Exhaust fan stage
Continuous exhaust fan
The exhaust fan is then working in parralel with the blower (see relative §) with a nominal air fl ow threshold (3864), a minimum
air fl ow threshold (3865) and a coeffi cient to compensate the fresh air damper closing (3866).
Settings
The different settings to adjust the exhaust fan are available in the menu:
opening percentage threshold of actuator for 1st fan
(3861):
opening percentage threshold of actuator for 2nd fan
(3862):
(3863):
opening percentage threshold of actuator for 3rd fan
(3864):
nominal threshold for air fl ow control
(3865):
low threshold for air fl ow control
(3866):
coeffi cient for compensation of losses of the air damper
CLIMATIC RT_UNITARY-IOM-1508-E
Fresh air opening (%)
• 23 •